Improvement in vault-covers



UNITED STATES JOSHUA K. lrNcfALLs,

PATENT OFFICE.

OF NEVV YORK, N. Y.

IMPROVEMENT IN VAULT-COVERS.

Specieation forming part of Letters Patent No. 170,567, dated November 30, 1875; application tiled November 2, 1875. i

T0 all whom it may concern:

Be it known that I, JOSHUA K. ING-ALES, of the city, county, and State of New York, have invented certain Improvements in Illuminating Vault-Covers, of which the-following is a specification:

My invention relates to that class of vaultcovers having a surface mainly of non-slippery material; and it consists essentially in lenses with a concave upper face set in a recessed or celled plate of metal, and surrounded by a safety-ring, forming a part of the said plate, which rises above the level of the lenses. The cellular` interstices between the safety-rings may be filled with cement, concrete, or some similar material.

In the drawings, Figure lis a plan of a portion of my improved cover. Fig. 2 is a vertical section of the same, taken in the plane indicated by the line w m in Fig. l.

In carrying out my invention, a plate, A, preferably of cast metal, is perforated for lenses B B, as shown at C C, where the lenses have been purposely omitted. The plate A is recessed to form cells between the glasses or lenses, leaving a thin bottom web and safetyrings b b around the lenses. These rings rise above the lenses, and their cement setting c, as shown, and protect their concave upper surfaces from abrasion. Webs a. a connecting the rings b b, but not rising to their level, may be left for strength. The cells between the safetyrings are iilled with some nonslippery material D, which may be concrete,

' composed of sand or gravel and cement-Portland cement being preferred-or with a bond composed of melted sulphur, sand, and coaltar or asphaltum or other fusible mixture; or blocks of artificial stone may be fitted to the cells and fixed with cement.

For the better illustration of my construction, I have shown that portion vof the plate to the right hand denuded of the concrete filling.v The lens B rests on a iiange or shoulder, c, and it may be secured in place by means of cement c, or by any method known to the trade. general level of the concrete D, or may rise slightly above it. They form not only a protection to the lenses and their cement, but a disconnected traction surface to prevent slipping.

I am fully aware that the combination of lenses, a metal plate, and concrete filling is old, and I make no broad claim to it; but

What I do claim is- In a vault-cover composed mainly of metal and glass, the combination of the lenses B B, having a concave upper surface, and the safety-rin gs b b, surrounding said lenses, and rising above their level, as shown, to protect them from abrasion, and prevent the loosening of the' cement, substantially as specilied.

In witness whereof I have hereunto signed my name in the presence of two. subscribing Witnesses.

JOSHUA K. INGALLS. Witnesses SAM. TRO. SMITH, HENRY CONNETT.

These rings b b may be flush with the' 

